单柱双跨PBA暗挖车站二次衬砌扣拱跳仓施工技术

CONSTRUCTION TECHNOLOGY OF THE SECOND LINING BUCKLE ARCH SKIPPING WAREHOUSE IN A SINGLE–COLUMN DOUBLE–SPAN PBA UNDERGROUND EXCAVATION STATION

二次衬砌扣拱施工为PBA暗挖车站施工的关键节点,二次衬砌扣拱每个施工段的长度受到严格控制。以跳仓严控、拉长补仓为原则,采用非对称式分段跳仓法进行二次衬砌扣拱,多段同时施工,并形成有效的流水作业。本技术能够减小一次破除长度,从而减少扣拱施工风险,同时提高整体施工效率,加快施工进度。基于此,以哈尔滨轨道交通2号线某站为背景,介绍单柱双跨式PBA暗挖车站二次衬砌扣拱非对称式跳仓施工技术。

The construction of the second lining buckle arch is the key node in the construction of the PBA underground excavation station. The length of each construction section of the second lining buckle arch is strictly controlled. This technology uses the principle of strict control of skipping and lengthening and replenishment, and adopts asymmetric The method of step–by–step skipping is carried out with two lining buckle arches, and multiple sections are constructed at the same time to form an effective streamline operation. This technology can reduce the length of one–time demolition, thereby reducing the construction risk of buckling arches, and at the same time improving the overall construction efficiency and speeding up the construction progress. This article takes the Nanzhi Road Station of Harbin Rail Transit Line 2 as the background, and introduces the construction technology of asymmetrical warehouse jumping of the second lining buckle arch of the single–column double–span PBA subsurface excavated station.